Cushioning device.



E. SOHUGH. GUSHIONING DEVICE.

Y APPLICATION FILED JULY 15, 1913. 1,084,491

vvrTNEssEs INVENTOR 90 EMIL. 5cm/CH MM BY M w ATTORNEYS Patented Jan.13, 1914.

EMIL SGHUCI-I, OF MUNICH, GERMANY.

CUSHIONING DEVICE.

Specification of Letters Patent.

' Patented Jan. is, 1914i..

Application filed July 15. 1913. Serial No. 779,109.

To all 'LU/0m t may concern:

Be it known that I, EMIL SCHUCH, a subject of the King of Bavaria,residing at 25 Giselastrasse, Munich, Bavaria, Germany, have inventedcertain new and useful Improvements in Cushioning Devices; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention.

The linvention relates to pressure indicators or other pressuremeasuring apparatus employed for indicating and recording the pressureof liquids.

The object of the invention is to provide a new and improvedA cushioningdevice arranged to cushion the plunger in the pressure cylinder on thesudden application of the initial pressure, so that the indicatormechanism is not subjected to sudden dangerous shocks or jars.

In order to accomplish the desired result, use is made of a pressurevcylinder having a partition dividingthe cylinder into inner and outerpressure chambers filled with a liquid, and a plunger slidable in thepressure cylinder and extending through the inner chamber into theouter; chamber, the plunger having means to connect one chamber with theother after initial pressure has been exerted against the entire area ofthe plunger and the latter has moved to connect the chambers with eachother so that fora short moment the pressure is exerted against areduced area of the plunger.

A practical embodiment of the invention is represented in theaccompanying drawings forming a part of this specication, in whichsimilar characters of reference indicate corresponding parts in all theviews.

Figure 1 is a sectional side elevation of the cushioningkdevice; Fig. 2is'an inverted sectional plan view of the same on the line 2 2 of Fig.1; Fig. 3 is a sectional side elevation of the partition and a modifiedform of the plunger; and Fig. 4: is an inverted sectional plan view ofthe same on the line 4 4 of Fig. 3.

The pressure cylinder a is provided with a partition Z) in which isslidably mounted a plunger c pressed on by a spring e abutting with itsouter end of a cap f and resting at its inner end on a collar g arrangedon thel plunger c so as to normally hold the plunger in the positionshown in Fig. 1. 'Ihe partition b is preferably screwed into thel lowerend of the pressure cylinder a and is provided with a perforated sleeveZ carrying a packingr to prevent leakage past the plunger c into theupper end of the cylinder a containing the spring e.

By reference to Fig. 1 it will be noticed that the partition b dividesthe cylinder a into an inner chamber z' and an outer chamber is, ofwhich the latter is closed by a cap d connected by a pipe or other meanswith a source of liquid pressure supply. The lower end of the plunger cis provided with channels 0, which may be arranged exteriorly, as shownin Figs. 1 and 2, or interiorly, as indicated in Figs. 3 and 4, theupper ends of the channels terminating within the partition at the timethe plunger c is in normal position, as illustrated in Figs. 1 and 3.Both chambers z' and lo are filled with liquid and are disconnected fromeach other as long as the plunger o is in a normal position. The upperend m of the plunger c is connected in the usual manner with theoperating mechanism of the pressure indicator or other pressuremeasuring apparatus employed for recording the pressure of a liquid.

The operation is as follows: When the liquid in the outer chamber 7c issubjected to pressure then an initial movement is given to the plunger cin an upward direction against the tension of the spring e, the pressurebeing exerted against the full area of the plunger. Immediately afterthe plunger c begins to move its 'channels o connect with the innerchamber i and consequently pressure is exerted by the liquid onto theliquid contained in the inner chamber z', and when this takes place thepressure against the plunger c is reduced owing to the pressure beingexerted against a reduced area yof the plunger c, that is, that portionoccupied by the channels 0. This reduction of pressure on the plunger ctakes place in an exceedingly short period of time, and as it is notintended to reduce the pressure but only the jar or shock incident tothebeginning period of pressure, it is evident that a cushioning isobtained in an exceedingly short time.

At the end of the pressure period the pres- 'inder a into two chamberslled with liquid it is possible to cushion the hammer action of theapplied pressure so that the indicator mechanism is not subjected todangerous shocks or jars.

I claim as my invention:

l. A cushioning device for pressure Ineas'- uring instruments,comprising a pressure cylinder and a plunger therein for operating anindicator, the pressure cylinder having a partition dividing the saidcylinder into two chambers filled Wit-h a liquid and of Which the outerchamber is connected with a source of pressure supply, the said chambersbeing disconnected when the plunger is in its initial position, butconnected With each other by openings Within the plunger immediatelyafter the pressure is applied and the plunger has started on its initialmovement.

2. A cushioning device for pressure meas- EMIL SCHUCH. y

Witnesses:

HniNns HIRSCH, A. V. W. CoYL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of latents,

i Washington1 I). C.

